Most schools interview through February or, in some cases, early March. If you don't get an interview invitation by March you can assume you will not be attending that school.
Schools aren't obliged to give you any sort of final answer. Some will send rejections throughout the cycle, some will send all in a batch in Spring, and some will never send any. If you're curious the best thing to do is look through previous school-specific threads to get an idea of how last year's cycles went.